Tim Holtz Retractable Craft Knife Refill Blades 5 pack - Suits 3356E - Tim Holtz is a designer with a difference. His unique style and techniques demand unique tools of quality. The Tonic Studios Tim Holtz range of products have been designed, developed and endorsed by Tim Holtz. Keep sharp with the Retractable Craft Knife Spare Blades refill pack. Suits the Tim Holtz Retractable Craft Knife (Item 3356E).